Which is the best Off Page SEO Factor?

[sulbha]

hi,
1). Community Creation in Social Networking Sites
2). Blogging
3). Forum Postings
4). Search Engine Submission
5). Directory Submission
6). Social Bookmarking
6). Link Exchange
7). Link Baiting
8). Cross-Linking
9). Photo Sharing
10). Video Promotions
11). Business Reviews
12). Local Listings & Yellow Pages
13). Article Submission
14). Press Release Promotion
15). Classifieds Submission
16). Social Shopping Network
17). Answers